US6375683B1 - Implant in particular for replacing a vertebral body in surgery of the spine - Google Patents
Implant in particular for replacing a vertebral body in surgery of the spine Download PDFInfo
- Publication number
- US6375683B1 US6375683B1 US09/423,173 US42317300A US6375683B1 US 6375683 B1 US6375683 B1 US 6375683B1 US 42317300 A US42317300 A US 42317300A US 6375683 B1 US6375683 B1 US 6375683B1
- Authority
- US
- United States
- Prior art keywords
- implant
- faces
- cam
- bearing
- pairs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/001—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper stackable
- B65D5/005—Separate or attached stacking elements
- B65D5/006—Separate corner posts and like elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
- B65D5/42—Details of containers or of foldable or erectable container blanks
- B65D5/44—Integral, inserted or attached portions forming internal or external fittings
- B65D5/48—Partitions
- B65D5/48002—Partitions integral
- B65D5/48022—Partitions integral formed by two parallel panels located in the base of a tray being folded up towards each other
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
- A61B17/025—Joint distractors
- A61B2017/0256—Joint distractors for the spine
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- A—HUMAN NECESSITIES
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
-
- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30143—Convex polygonal shapes hexagonal
-
- A—HUMAN NECESSITIES
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30224—Three-dimensional shapes cylindrical
- A61F2002/30225—Flat cylinders, i.e. discs
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/3028—Three-dimensional shapes polyhedral different from parallelepipedal and pyramidal
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
- A61F2002/30324—The prosthesis having different structural features at different locations within the same prosthesis differing in thickness
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30354—Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
- A61F2002/30355—Cylinder of elliptical or oval basis
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
- A61F2002/3037—Translation along the common longitudinal axis, e.g. piston
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30362—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit with possibility of relative movement between the protrusion and the recess
- A61F2002/3037—Translation along the common longitudinal axis, e.g. piston
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0017—Angular shapes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/006—Additional features; Implant or prostheses properties not otherwise provided for modular
- A61F2250/0063—Nested prosthetic parts
Definitions
- implants of this type are already known, and conventionally they comprise two elements for bearing against the overlying and underlying vertebral plates, and means for verifying the distance between said bearing elements so as to match the implant to the height required as a function of the morphology of the patient's spine.
- the means for varying the height of the implant can comprise a rotary member, together with screw-and-nut type means.
- a major drawback of that known implant lies in that the rotary member must be turned about an axis that is substantially parallel to the axis of the spinal column. This can make it extremely difficult to bring the implant to the desired height since the tool used for turning said member, given the surrounding environment of the patient, can be turned through only a small fraction of a complete turn, so it must be maneuvered many times in order to reach the desired height. This is made worse by the fact that the thread must necessarily be fine so as to generate the axial force required for separation purposes without running the risk of producing slip between the bearing elements and the over-and underlying vertebral plates.
- the present invention seeks mainly to mitigate that drawback, and to propose an implant for replacing a vertebral body, which implant is simpler to handle when being put into place when performing separation, and which is also provided with excellent stability against the axial compression forces to which it will be exposed.
- the present invention provides an implant specifically for replacing a vertebral body in surgery of the spine, the implant comprising first and second bearing elements for bearing against under-and overlying vertebral plates, retaining means for retaining the two bearing elements one above the other, and at least one moving member suitable for varying the distance between said bearing elements, the implant being characterized in that the retaining means comprise at least one slideway means provided between the two bearing elements, and in that the or each moving member is constituted by a cam having discrete positions suitable for being rotated about an axis that is essentially horizontal and essentially parallel to the sagittal plane.
- the or each discrete-position cam has, in cross-section, an outline in the form of an irregular polygon
- the or each cam possesses a plurality of pairs of faces, the faces in each pair being mutually parallel, and each pair of faces being spaced apart at a distance different from the spacing between the other pairs of faces;
- the cam has three pairs of faces
- each bearing element possesses a bearing plate having a groove formed in one face thereof, and at least some of the pairs of faces are dimensioned in such a manner as to be of a length in the circumferential direction of the cam that is very slightly shorter than the width of each groove;
- the faces of at least one pair of faces of the cam are of a length, in the circumferential direction of the cam, which is matched to the width of the grooves in the bearing plates by means of respective setbacks provided in transitions between said faces and adjacent faces;
- the or each cam is mounted to move in rotation and in translation on the or each slideway means;
- the or each slideway comprises a hollow slideway-forming upright formed from one element of the implant, and a slider-forming element formed from another element of the implant, and the slideway and the slider have elongate openings passing through them to pass a cam-mounting shaft;
- the cam-mounting shaft is defined by a screw passing through a central passage of the cam and through said elongate openings, and engaged in a nut;
- one of the elongate openings of the slideway is a notch suitable for preventing the nut from rotating
- the bearing elements have teeth on their outside surfaces for engaging in the vertebrae lying over and under the implant;
- the implant comprises two bearing elements and a central element, two cams operating respectively between the top bearing element and the central element and between the bottom bearing element and the central element, and two slideway-forming means operating respectively between the top bearing element and the central element and between the bottom bearing element and the central element.
- FIGS. 1 and 2 are exploded perspective views of an implant of the invention seen from two different directions;
- FIGS. 3 and 4 are perspective views of an implant of the invention in the assembled state, seen from two different directions;
- FIG. 5 is an elevation view of the side of the assembled implant of FIGS. 3 and 4;
- FIG. 6 is an elevation view of the face of the assembled implant of FIGS. 3 to 5 ;
- FIG. 7 is a plan view of the assembled implant of FIGS. 3 to 6 ;
- FIG. 8 is an exploded perspective view of a variant embodiment of an implant.
- an implant for replacing a vertebral body comprising seven elements, namely: a central element 10 ; two bearing elements 20 a and 20 b , respectively constituting a top bearing element and a bottom bearing element; two elements forming cams having discrete positions and respectively referenced 30 a and 30 b , one operating between the element 10 and the element 20 a , and the other operating between the element 10 and the element 20 b ; and finally two screws 40 a and 40 b suitable for co-operating with two nuts 50 a and 50 b to hold the assembled implant firmly in the required position.
- the central element 10 comprises an intermediate plate 11 that is generally in the form of a horizontal disk. From this disk there extend upwards and downwards respectively a first slideway-forming hollow cylindrical upright 13 a , and a second slideway-forming hollow cylindrical upright 13 b situated vertically in line with the upright 13 a .
- the section of the slideways 13 a and 13 b is oval in shape.
- Each slideway extends from the vicinity of one edge of the disk 11 and has a respective oblong through slot 15 a , 15 b in its inside face, and has a respective vertically elongate notch 14 a , 14 b in its outside face, where the notch is slightly wider than the slot and opens out to the free end of the associated slideway.
- each slideway 13 a , 13 b has a small respective setback 16 a , 16 b in its inside face, with the oblong slot 15 a or 15 b passing through the bottom wall of the corresponding setback.
- the central element 10 has a shallow groove 12 a of predetermined width in the top face of the disk 11 , which groove extends essentially along a diameter of the disk away from the slideway 13 a as far as the opposite edge of the disk.
- An identical and symmetrical groove 12 b is formed in the bottom face of the disk 11 .
- the top element 20 a of the implant has a top plate 21 from which there extends downwards a solid slider 23 which is integral with the plate and whose section is slightly smaller than that of the inside section of the slideway 13 a , said slider 23 having a slot 24 passing through it of a size that is close to the size of the slot 15 a in the element 10 .
- a series of teeth 26 is formed on the top surface of the plate 21 for reasons explained below, which teeth are more particularly of pyramid shape.
- the bottom face of the plate 21 has a groove 22 formed therein of shape and size that are preferably identical to the shape and size of the groove 12 a in the central disk 11 of the element 10 .
- the bottom element 20 b is completely identical to the top element 20 a , after merely being turned upside-down through 180°.
- the element forming a discrete-position cam referenced 30 a for acting between the elements 10 and 20 a has an irregular and generally hexagonal outline in cross-section. More precisely, the element 30 a possesses:
- transitions between the faces 32 and 33 and between the faces 32 ′ and 33 ′ are provided with respective setbacks 321 and 321 ′ whose bottoms are parallel to the respective faces 32 and 32 ′ and of depth substantially equal to the depth of the grooves 12 a , 12 b , and 22 formed respectively in each of the faces of the central disk 11 of the element 10 and in the inside faces of the plates 21 of the elements 20 a and 20 b.
- the lengths (i.e. dimensions in the circumferential direction) of the various faces of the element 30 a are as follows:
- the large faces 31 and 31 ′ are of length greater than the width of the grooves 12 a , 12 b , and 22 ;
- the middle faces 32 and 32 ′ are of effective length that is very slightly shorter than the width of the grooves 12 a , 12 b , and 22 ;
- the small faces 33 and 33 ′ are likewise of an effective length that is very slightly smaller than the width of the grooves 12 a , 12 b , and 22 .
- the element 30 a also possesses a central through bore 34 which terminates at one of the side faces of the element in an enlarged portion 35 of hexagonal section, forming a socket for receiving a tool as explained below.
- the cam-forming element 30 b for operating between the elements 10 and 20 b is completely identical to the element 30 a.
- the implant of the invention has two identical screws 40 a and 40 b each possessing a head 41 provided with a socket 43 for a driving tool, and a threaded shank 42 , and also has two nuts 50 a and 50 b of square outline with rounded corners, each having a tapped bore 51 passing therethrough complementary to the thread of the screws.
- the cross-section of the sockets 35 is larger than that of the heads 41 of the screws 40 a and 40 b , while the depth of said sockets 35 is perceptibly greater than the axial dimension of said heads 41 ;
- the outside diameter of the threaded shanks 42 is slightly smaller than the diameter of the bores 34 through the elements 30 a and 30 b ;
- each nut 50 a and 50 b is selected to be slightly smaller than the width of the notches 14 a and 14 b formed in the uprights 13 a and 13 b of the element 10 ;
- the implant is assembled by inserting the sliders 23 of the elements 20 a and 20 b in the respective slideways 13 a and 13 b of the element 10 . Thereafter the elements 30 a and 30 b are prepositioned between the plate 21 of the element 20 a and the plate 11 , or between the plate 21 of the element 20 b and the plate 11 , such that the respective bores 34 thereof are in register with the respective slots 15 a and 15 b . Then the screws 40 a and 40 b are engaged in the respective passages 35 and 34 , in the slots 15 a and 15 b , and in the notches 14 a and 14 b where they are screwed into the respective nuts 50 a and 50 b.
- the cam-forming elements 30 a and 30 b Prior to the implant being put into place, the cam-forming elements 30 a and 30 b are initially set to their minimum height, i.e. they have their large faces 31 and 31 ′ bearing against the facing faces of the respective plates, projecting on either side of the grooves 12 a , 12 b , and 22 so as to provide a stable bearing force.
- the implant is put into place by the surgeon between the vertebral plates of the over-and underlying vertebrae, and if necessary the surgeon performs a small amount of separation to make this possible.
- the screws 40 a and 40 b are tightened by means of an appropriate tool to confirm the fixing of the various elements in the required position, the nuts 50 a and 50 b being blocked against any rotation within the notches 14 a and 14 b.
- FIG. 8 shows a variant embodiment of the invention which can be used when it is desired to obtain an implant of small height.
- cam-forming element 30 is provided associated with two vertebral thrust elements 100 and 200 .
- the element 100 has a bottom plate 11 provided with teeth 26 on its bottom face and a slideway 13 , and with a groove 12 in its top face.
- the element 200 possesses a top plate 21 provided with teeth 26 on its top face and with a slider 23 , and with a groove (not shown) in its bottom face.
- the cam 30 , the screw 40 , and the nut 50 are identical to the corresponding elements in the preceding embodiment.
Abstract
Description
Claims (20)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9705465A FR2762778B1 (en) | 1997-05-02 | 1997-05-02 | IMPLANT, IN PARTICULAR FOR THE REPLACEMENT OF A VERTEBRAL BODY IN RACHIS SURGERY |
FR9705465 | 1997-05-02 | ||
PCT/FR1998/000879 WO1998049975A1 (en) | 1997-05-02 | 1998-04-30 | Implant in particular for replacing a body of vertebrae in backbone surgery |
Publications (1)
Publication Number | Publication Date |
---|---|
US6375683B1 true US6375683B1 (en) | 2002-04-23 |
Family
ID=9506553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/423,173 Expired - Lifetime US6375683B1 (en) | 1997-05-02 | 1998-04-30 | Implant in particular for replacing a vertebral body in surgery of the spine |
Country Status (11)
Country | Link |
---|---|
US (1) | US6375683B1 (en) |
EP (1) | EP0986350B1 (en) |
JP (1) | JP2001523138A (en) |
KR (1) | KR100533898B1 (en) |
AT (1) | ATE230246T1 (en) |
AU (1) | AU737948B2 (en) |
CA (1) | CA2289559C (en) |
DE (2) | DE69810466T2 (en) |
ES (1) | ES2149741T3 (en) |
FR (1) | FR2762778B1 (en) |
WO (1) | WO1998049975A1 (en) |
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Also Published As
Publication number | Publication date |
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FR2762778B1 (en) | 1999-07-16 |
WO1998049975A1 (en) | 1998-11-12 |
FR2762778A1 (en) | 1998-11-06 |
KR20010012197A (en) | 2001-02-15 |
EP0986350B1 (en) | 2003-01-02 |
CA2289559C (en) | 2006-04-18 |
DE986350T1 (en) | 2001-07-05 |
ATE230246T1 (en) | 2003-01-15 |
DE69810466D1 (en) | 2003-02-06 |
EP0986350A1 (en) | 2000-03-22 |
ES2149741T3 (en) | 2003-06-16 |
AU737948B2 (en) | 2001-09-06 |
CA2289559A1 (en) | 1998-11-12 |
KR100533898B1 (en) | 2005-12-07 |
ES2149741T1 (en) | 2000-11-16 |
DE69810466T2 (en) | 2003-11-27 |
AU7537698A (en) | 1998-11-27 |
JP2001523138A (en) | 2001-11-20 |
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